68 Roadrunner questions

1968 Roadrunner
1. The dealer told me I have a 727 manual valve body transmission. The factory speedometer does not work. What do I need to make the speedometer work with the 727 transmission?
2. I was also told the oil pan holds 7 qts. But the dipstick looks like it may be the original. When going from a 5 qt to a 7 qt, is the pan wider, not deeper, thus using a 5qt Dipstick would work ok?
Author: Chevysucks